Democratic presidential candidates Barack Obama and Hillary Clinton met Thursday in the first of two debates leading up to the March 4 Ohio and Texas primaries. Judy Woodruff reports on the highlights of the debate, held in Austin, Texas.

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Barack Obama campaigned Wednesday as the Democratic front runner after victories in Wisconsin and Hawaii -- and ran into new criticism from his rival, Hillary Clinton, and from top Republican candidate John McCain, who said the Illinois senator waffled on…

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The tight battle for the 2008 Democratic presidential nomination is putting the formerly obscure super delegate system under scrutiny. A government professor discusses the role of the appointed super delegates in the Democratic nomination.

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Democratic presidential candidates Sens. Barack Obama and Hillary Clinton -- still locked in a battle for delegates -- are jockeying for voter support before Tuesday's Wisconsin primary. Two journalists discuss the state of the race in the Badger State.

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Presidential candidate Sen. Hillary Clinton, D-N.Y., released a negative campaign ad, prominent lawmakers reconsidered their endorsements and Congress questioned pitcher Roger Clemens over steroid use allegations. Mark Shields and David Brooks discuss the week's news.

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Riding a wave of eight straight victories, Sen. Barack Obama took aim at Republican front-runner Sen. John McCain Tuesday night, largely ignoring his still-close battle with Sen. Hillary Clinton.

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Sen. Barack Obama scored three decisive victories Saturday night, winning a key primary in Louisiana and scoring two more caucus wins in Washington State and Nebraska.

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The neck-and-neck battle for the Democratic nomination continues this weekend as voters in four states plus the Virgin Islands head to polls or caucuses.

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Despite breathless reporting around the results in 24 states on Super Tuesday, the storyline in both the Democratic and Republican races remained largely the same as it had been earlier this week.

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Calling for a "politics of common sense" and saying his campaign represented an unprecedented coalition of Americans, Sen. Barack Obama celebrated a 27-point victory Saturday in South Carolina.

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